On 7/26/19, Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote: > On Fri, Jul 26, 2019 at 01:18:06PM +0300, Jari Ruusu wrote: >> Shouldn't those clobber contraints actually be: "memory","cc" >> That is because addl subl (and other) machine instructions >> actually modify the flags register too. >> >> gcc docs say: The "cc" clobber indicates that the assembler >> code modifies the flags register. > > GCC x86 assumes any asm() will clobber "cc". No worries then. Thanks for your clarification. -- Jari Ruusu 4096R/8132F189 12D6 4C3A DCDA 0AA4 27BD ACDF F073 3C80 8132 F189
